I have a Rambo that failed a while back, it seems to be a bootloader issue. Is there anywhere I can send it to that can repair it if I can’t get it going on my own? Thanks, Greg.
Try Ultimachine. They may be able to service it or rma it.
You should be able to reprogram the board with an AVR interface for less than $20 and some time:
https://www.amazon.com/gp/product/B01BHHH714/
I tried that, and it didn’t work. Also, the programmer you referred to will not work on a Rambo.
Good to know. Thank you for the clarification!